SapphireBlue

I'm looking for a manhwa/manhua. I don't remember exactly the plot but I'm pretty sure it was an omegaverse; one of the main characters (omega boy) had a granny (supposedly a female alfa) that had like a greenhouse with roses. Both main characters help her to restore the greenhouse but in the end she dies.
At the beginning of the story they were pretending to be a couple but in the end they got up together. Pls I'm dying to re-read it again（/TДT)/